Aptitude - Arithmetical Ability

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49.

A pipe A can fill the tank in 10 hrs, B can fill it in 20 hrs and C can empty in 40 hrs. All are opened at the same time. After how many hours shall the pipe B be closed such that the tank can be filled in 10 hrs?                        
A. 5 hrs B. 6 hrs
C. 7 hrs D. 8 hrs



50.

Three pipes A, B and C can fill a tank in 6 hours. After working at it together for 2 hours, C is closed and A and B can fill the remaining part in 7 hours. The number of hours taken by C alone to fill the tank is:                        
A. 10 B. 12
C. 14 D. 16



51.

A pipe can fill a tank in 5 hrs but because of a leak a the bottom it takes 1 hr extra. In what time can the leak alone empty the tank?                        
A. 30 hrs B. 24 hrs
C. 42 hrs D. 22 hrs




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